new library spi2Csr (skeleton)

README

@@ -2,7 +2,7 @@
 ------------
 
 This is a small Logic Analyser to be embedded in a Fpga design to debug internal
-or external.signals.
+or external signals.
 
 [> Status:
 Early development phase

migScope/__init__.py

@@ -268,7 +268,6 @@ class Trigger:
 		
 		# Connect output of trig elements to sum
 		# Todo : Add sum tree to have more that 4 inputs
-		
 		comb+= [self._sum.i[j].eq(self.ports[j].o) for j in range(len(self.ports))]
 		
 		# Connect sum ouput to hit
@@ -281,7 +280,6 @@ class Trigger:
 			frag += port.get_fragment()
 		comb+= [self.dat.eq(self.in_dat)]
 		
-		
 		#Connect Registers
 		for i in range(len(self.ports)):
 			if isinstance(self.ports[i],Term):
@@ -469,9 +467,6 @@ class Recorder:
 			self.storage.get_fragment()+self.sequencer.get_fragment()+\
 			Fragment(comb=comb, sync=sync)
 
-
-
-
 class MigCon:
 	pass
 	

spi2Csr/__init__.py

@@ -0,0 +1,157 @@
+from migen.fhdl.structure import *
+from migen.bus import csr
+from migen.bank import description, csrgen
+from migen.bank.description import *
+
+class Spi2Csr : 
+	def __init__(self, a_width, d_width, max_burst = 8):
+		self.a_width = a_width
+		self.d_width = d_width
+		self.max_burst = 8
+		# Csr interface
+		self.csr = csr.Interface(self.d_width)
+		# Spi interface
+		self.spi_clk = Signal()
+		self.spi_cs_n = Signal()
+		self.spi_mosi = Signal()
+		self.spi_miso = Signal()
+		self.spi_int_n = Signal()
+		
+	def get_fragment(self):
+		comb = []
+		sync = []
+		
+		# Resychronisation
+		spi_clk_d1 = Signal()
+		spi_clk_d2 = Signal()
+		spi_clk_d3 = Signal()
+		
+		sync += [
+			spi_clk_d1.eq(self.spi_clk),
+			spi_clk_d2.eq(spi_clk_d1),
+			spi_clk_d3.eq(spi_clk_d2)
+		]
+		
+		spi_cs_n_d1 = Signal()
+		spi_cs_n_d2 = Signal()
+		spi_cs_n_d3 = Signal()
+		
+		sync += [
+			spi_cs_n_d1.eq(self.spi_cs_n),
+			spi_cs_n_d2.eq(spi_cs_n_d1),
+			spi_cs_n_d3.eq(spi_cs_n_d2)
+		]
+		
+		spi_mosi_d1 = Signal()
+		spi_mosi_d2 = Signal()
+		spi_mosi_d3 = Signal()
+		
+		sync += [
+			spi_mosi_d1.eq(self.spi_mosi),
+			spi_mosi_d2.eq(spi_mosi_d1),
+			spi_mosi_d3.eq(spi_mosi_d2)
+		]
+		
+		# Decode
+		spi_clk_rising = Signal()
+		spi_clk_falling = Signal()
+		spi_cs_n_active = Signal()
+		spi_mosi_dat = Signal()
+		
+		comb += [
+			spi_clk_rising.eq(spi_clk_d3 & ~spi_clk_d2),
+			spi_clk_falling.eq(~spi_clk_d3 & spi_clk_d2),
+			spi_cs_n_active.eq(~spi_cs_n_d3),
+			spi_mosi_dat.eq(spi_mosi_d3)
+		]
+		
+		#
+		# Spi --> Csr
+		#
+		spi_cnt = Signal(BV(bits_for(self.a_width+self.max_burst*self.d_width)))
+		spi_addr = Signal(BV(self.a_width))
+		spi_w_dat = Signal(BV(self.d_width))
+		spi_r_dat = Signal(BV(self.d_width))
+		spi_we = Signal()
+		spi_re = Signal()
+		spi_we_re_done = Signal(reset = 1)
+		spi_miso_dat = Signal()
+		
+		# Re/We Signals Decoding
+		first_b = Signal()
+		last_b = Signal()
+		
+		comb +=[
+			first_b.eq(spi_cnt[0:bits_for(self.d_width)] == 0),
+			last_b.eq(spi_cnt[0:bits_for(self.d_width)] == 2**self.d_width-1)
+		]
+		sync +=[
+			If(spi_cnt >= self.a_width & first_b,
+				spi_we.eq(spi_addr[self.a_width-1] & ~spi_we_re_done),
+				spi_re.eq(~spi_addr[self.a_width-1] & ~spi_we_re_done),
+				spi_we_re_done.eq(1)
+			).Else(
+				spi_we.eq(0),
+				spi_re.eq(0),
+				spi_we_re_done.eq(0)
+			)
+		]
+		
+		# Spi Addr / Data Decoding
+		sync +=[
+			If(~spi_cs_n_active,
+				spi_cnt.eq(0),
+			).Elif(spi_clk_rising,
+				# addr
+				If(spi_cnt < self.a_width,
+					spi_addr.eq(spi_addr[0:self.a_width-1]&spi_mosi_dat)
+				).Elif(spi_cnt >= self.a_width+self.d_width & last_b,
+					spi_addr.eq(spi_addr+1)
+				).Elif(spi_cnt >= self.a_width & last_b & spi_cnt[self.a_width-1] == 0,
+					spi_addr.eq(spi_addr+1)
+				),
+				# dat
+				If(spi_cnt >= self.a_width,
+					spi_w_dat.eq(Cat(spi_w_dat[:self.d_width],spi_mosi_dat))
+				),
+				
+				# spi_cnt
+				spi_cnt.eq(spi_cnt+1)
+			)
+		]
+		
+		#
+		# Csr --> Spi
+		#
+		spi_r_dat_shift = Signal(BV(self.d_width))
+		sync +=[
+			If(spi_re,
+				spi_r_dat_shift.eq(spi_r_dat)
+			),
+			
+			If(~spi_cs_n_active,
+				spi_miso_dat.eq(0)
+			).Elif(spi_clk_falling,
+				spi_miso_dat.eq(spi_r_dat_shift[self.d_width-1]),
+				spi_r_dat_shift.eq(Cat(spi_r_dat_shift[:self.d_width-2],0))
+			)
+			]
+			
+		
+		#
+		# Csr Interface
+		#
+		comb += [
+			self.csr.adr.eq(spi_addr),
+			self.csr.dat_w.eq(spi_w_dat),
+			self.csr.we.eq(spi_we)
+		]
+		
+		#
+		# Spi Interface
+		#
+		comb += [
+			spi_r_dat.eq(self.csr.dat_r),
+			self.spi_miso.eq(spi_miso_dat)
+		]
+		return Fragment(comb=comb,sync=sync)

top.py

@@ -6,6 +6,7 @@ from migen.fhdl import verilog, autofragment
 from migen.bus import csr
 
 import migScope
+import spi2Csr
 
 #
 #Test Term
@@ -73,13 +74,21 @@ import migScope
 #
 #Test Trigger
 #
-term0 = migScope.Term(32)
-term1 = migScope.RangeDetector(32)
-term2 = migScope.EdgeDetector(32)
-term3 = migScope.Term(32)
+#term0 = migScope.Term(32)
+#term1 = migScope.RangeDetector(32)
+#term2 = migScope.EdgeDetector(32)
+#term3 = migScope.Term(32)
 
-trigger0 = migScope.Trigger(0,32,64,[term0, term1, term2, term3])
-#trigger0 = migScope.Trigger(0,32,64,[term0])
-v = verilog.convert(trigger0.get_fragment())
+#trigger0 = migScope.Trigger(0,32,64,[term0, term1, term2, term3])
+#recorder0 = migScope.Recorder(0,32,1024)
+#v = verilog.convert(trigger0.get_fragment()+recorder0.get_fragment())
+#print(v)
+
+#
+#Test spi2Csr
+#
+spi2csr0 = spi2Csr.Spi2Csr(16,8)
+v = verilog.convert(spi2csr0.get_fragment())
 print(v)
 
+